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/*
 * Copyright © 2024 XDEV Software (https://xdev.software)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package software.xdev.tci.network;

import java.util.Optional;
import java.util.UUID;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.Executor;
import java.util.concurrent.Executors;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.function.Supplier;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import software.xdev.tci.factory.prestart.config.PreStartConfig;


/**
 * Provides a pool of {@link LazyNetwork}
 */
public class LazyNetworkPool
{
	private static final Logger LOG = LoggerFactory.getLogger(LazyNetworkPool.class);
	
	protected static final AtomicInteger POOL_COUNTER = new AtomicInteger(1);
	
	protected static final AtomicInteger NETWORK_COUNTER = new AtomicInteger(1);
	
	@SuppressWarnings("resource")
	protected Supplier networkSupplier = () -> new LazyNetwork()
		.withName("lazynet-" + NETWORK_COUNTER.getAndIncrement() + "-" + UUID.randomUUID())
		.withCheckDuplicate(false);
	
	protected final LinkedBlockingQueue queue;
	protected final Executor executor;
	
	/**
	 * Like {@link #LazyNetworkPool(int)} but uses {@link PreStartConfig} to determine the size
	 */
	public LazyNetworkPool()
	{
		this(PreStartConfig.instance().keepReady("lazynetwork"));
	}
	
	public LazyNetworkPool(final int size)
	{
		this(size, Executors.newCachedThreadPool(defaultThreadFactory()));
	}
	
	public LazyNetworkPool(final int size, final Executor executor)
	{
		this.queue = size > 0 ? new LinkedBlockingQueue<>(size) : null;
		this.executor = executor;
	}
	
	public LazyNetworkPool withNetworkSupplier(final Supplier networkSupplier)
	{
		this.networkSupplier = networkSupplier;
		return this;
	}
	
	protected LazyNetwork bootNew()
	{
		final LazyNetwork network = this.networkSupplier.get();
		network.create(r -> CompletableFuture.runAsync(r, this.executor));
		return network;
	}
	
	public void managePoolAsync()
	{
		if(this.queue == null)
		{
			return;
		}
		
		CompletableFuture.runAsync(this::managePoolInternal);
	}
	
	protected synchronized void managePoolInternal()
	{
		try
		{
			while(this.queue.remainingCapacity() > 0)
			{
				this.queue.add(this.bootNew());
			}
		}
		catch(final Exception ex)
		{
			LOG.warn("Failed to replenish pool", ex);
		}
	}
	
	public LazyNetwork getNew()
	{
		if(this.queue == null)
		{
			return this.bootNew();
		}
		
		final LazyNetwork net = Optional.ofNullable(this.queue.poll()).orElseGet(this::bootNew);
		
		// Replenish
		this.managePoolAsync();
		
		return net;
	}
	
	public static ThreadFactory defaultThreadFactory()
	{
		final int poolNumber = POOL_COUNTER.getAndIncrement();
		
		final AtomicInteger counter = new AtomicInteger(1);
		return r -> {
			final Thread thread = new Thread(r);
			thread.setDaemon(true);
			thread.setName("LazyNetworkPool-" + poolNumber + "-" + counter.getAndIncrement());
			return thread;
		};
	}
}